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                    2.1：计数器示例
            
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                    第三章：基础组件
            
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                    3.1：Widget简介
            
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                    第四章：布局类组件
            
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                    4.2：线性布局（Row、Column）
            
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                    4.3：弹性布局（Flex）
            
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                    4.4：流式布局（Wrap、Flow）
            
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                    第五章：容器类组件
            
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                    5.1：填充（Padding）
            
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                    5.2：尺寸限制类容器（ConstrainedBox等）
            
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                    5.3：装饰容器（DecoratedBox）
            
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                    5.4：变换（Transform）
            
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                    5.5：Container容器
            
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                    5.6：Scaffold、TabBar、底部导航
            
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                    5.7：剪裁（Clip）
            
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                    第六章：可滚动组件
            
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                    6.1：可滚动组件简介
            
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                    6.2：SingleChildScrollView
            
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                    6.3：ListView
            
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                    6.4：GridView
            
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                    6.5：CustomScrollView
            
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                    6.6：滚动监听及控制（ScrollController）
            
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                    第七章：功能型组件
            
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                    7.1：导航返回拦截（WillPopScope）
            
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                    7.2：数据共享（InheritedWidget）
            
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                    7.3： 跨组件状态共享（Provider）
            
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                    7.4：颜色和主题（Theme）
            
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                    7.5：异步UI更新（FutureBuilder、StreamBuilder）
            
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                    7.6：对话框详解
            
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                    第八章：事件处理与通知
            
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                    8.1：原始指针事件处理
            
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                    8.2：手势识别
            
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                    8.3：全局事件总线
            
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                    8.4：通知(Notification)
            
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        <li class="chapter " data-level="3.2" data-path="./">
            
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                    第九章：动画
            
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                    9.1：Flutter动画简介
            
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                    9.2：动画结构
            
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                    9.3：自定义路由过渡动画
            
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                    9.4：Hero动画
            
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        <li class="chapter " data-level="3.2.5" data-path="stagger_animation.html">
            
                <a href="stagger_animation.html">
            
                    
                    9.5：交织动画
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.6" data-path="animated_switcher.html">
            
                <a href="animated_switcher.html">
            
                    
                    9.6：通用“动画切换”组件（AnimatedSwitcher）
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="3.2.7" data-path="animated_widgets.html">
            
                <a href="animated_widgets.html">
            
                    
                    9.7：动画过渡组件
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.3" data-path="../chapter10/">
            
                <a href="../chapter10/">
            
                    
                    第十章：自定义组件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.3.1" data-path="../chapter10/intro.html">
            
                <a href="../chapter10/intro.html">
            
                    
                    10.1：自定义组件方法简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.2" data-path="../chapter10/combine.html">
            
                <a href="../chapter10/combine.html">
            
                    
                    10.2：组合现有组件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.3" data-path="../chapter10/turn_box.html">
            
                <a href="../chapter10/turn_box.html">
            
                    
                    10.3：组合实例：TurnBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.4" data-path="../chapter10/custom_paint.html">
            
                <a href="../chapter10/custom_paint.html">
            
                    
                    10.4：自绘组件（CustomPaint与Canvas）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.5" data-path="../chapter10/gradient_circular_progress_demo.html">
            
                <a href="../chapter10/gradient_circular_progress_demo.html">
            
                    
                    10.5：自绘实例：圆形渐变进度条(自绘)
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.4" data-path="../chapter11/">
            
                <a href="../chapter11/">
            
                    
                    第十一章：文件操作与网络请求
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.4.1" data-path="../chapter11/file_operation.html">
            
                <a href="../chapter11/file_operation.html">
            
                    
                    11.1：文件操作
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.2" data-path="../chapter11/http.html">
            
                <a href="../chapter11/http.html">
            
                    
                    11.2：Http请求-HttpClient
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.3" data-path="../chapter11/dio.html">
            
                <a href="../chapter11/dio.html">
            
                    
                    11.3：Http请求-Dio package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.4" data-path="../chapter11/download_with_chunks.html">
            
                <a href="../chapter11/download_with_chunks.html">
            
                    
                    11.4：实例：Http分块下载
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.5" data-path="../chapter11/websocket.html">
            
                <a href="../chapter11/websocket.html">
            
                    
                    11.5：WebSocket
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.6" data-path="../chapter11/socket.html">
            
                <a href="../chapter11/socket.html">
            
                    
                    11.6：使用Socket API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.7" data-path="../chapter11/json_model.html">
            
                <a href="../chapter11/json_model.html">
            
                    
                    11.7：Json转Dart Model类
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.5" data-path="../chapter12/">
            
                <a href="../chapter12/">
            
                    
                    第十二章：包与插件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.5.1" data-path="../chapter12/develop_package.html">
            
                <a href="../chapter12/develop_package.html">
            
                    
                    12.1：开发package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.2" data-path="../chapter12/platform-channel.html">
            
                <a href="../chapter12/platform-channel.html">
            
                    
                    12.2：平台通道简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.3" data-path="../chapter12/develop_plugin.html">
            
                <a href="../chapter12/develop_plugin.html">
            
                    
                    12.3：开发Flutter插件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.4" data-path="../chapter12/android_implement.html">
            
                <a href="../chapter12/android_implement.html">
            
                    
                    12.4：插件开发：实现Android端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.5" data-path="../chapter12/ios_implement.html">
            
                <a href="../chapter12/ios_implement.html">
            
                    
                    12.5：插件开发：实现IOS端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.6" data-path="../chapter12/texture_platformview.html">
            
                <a href="../chapter12/texture_platformview.html">
            
                    
                    12.6：Texture和PlatformView
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.6" data-path="../chapter13/">
            
                <a href="../chapter13/">
            
                    
                    第十三章：国际化
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.6.1" data-path="../chapter13/multi_languages_support.html">
            
                <a href="../chapter13/multi_languages_support.html">
            
                    
                    13.1：让App支持多语言
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.2" data-path="../chapter13/locallization_implement.html">
            
                <a href="../chapter13/locallization_implement.html">
            
                    
                    13.2：实现Localizations
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.3" data-path="../chapter13/intl.html">
            
                <a href="../chapter13/intl.html">
            
                    
                    13.3：使用Intl包
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.4" data-path="../chapter13/faq.html">
            
                <a href="../chapter13/faq.html">
            
                    
                    13.4：国际化常见问题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.7" data-path="../chapter14/">
            
                <a href="../chapter14/">
            
                    
                    第十四章：Flutter核心原理
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.7.1" data-path="../chapter14/flutter_ui_system.html">
            
                <a href="../chapter14/flutter_ui_system.html">
            
                    
                    14.1：Flutter UI系统
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.2" data-path="../chapter14/element_buildcontext.html">
            
                <a href="../chapter14/element_buildcontext.html">
            
                    
                    14.2：Element和BuildContext
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.3" data-path="../chapter14/render_object.html">
            
                <a href="../chapter14/render_object.html">
            
                    
                    14.3：RenderObject与RenderBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.4" data-path="../chapter14/flutter_app_startup.html">
            
                <a href="../chapter14/flutter_app_startup.html">
            
                    
                    14.4：Flutter从启动到显示
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.5" data-path="../chapter14/image_and_cache.html">
            
                <a href="../chapter14/image_and_cache.html">
            
                    
                    14.5：Flutter图片加载与缓存
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">实例篇</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    第十五章：一个完整的Flutter应用
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    15.1：应用简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../chapter15/code_structure.html">
            
                <a href="../chapter15/code_structure.html">
            
                    
                    15.2：APP代码结构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../chapter15/models.html">
            
                <a href="../chapter15/models.html">
            
                    
                    15.3：Model类定义
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../chapter15/globals.html">
            
                <a href="../chapter15/globals.html">
            
                    
                    15.4：全局变量及共享状态
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../chapter15/network.html">
            
                <a href="../chapter15/network.html">
            
                    
                    15.5：网络请求封装
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../chapter15/entry.html">
            
                <a href="../chapter15/entry.html">
            
                    
                    15.6：App入口及首页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../chapter15/login_page.html">
            
                <a href="../chapter15/login_page.html">
            
                    
                    15.7：登录页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../chapter15/language_and_theme_setting.html">
            
                <a href="../chapter15/language_and_theme_setting.html">
            
                    
                    15.8：多语言和多主题
            
                </a>
            

            
        </li>
    

            </ul>
            
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                                <h1 id="97-&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;">9.7 &#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;</h1>
<p>&#x4E3A;&#x4E86;&#x8868;&#x8FF0;&#x65B9;&#x4FBF;&#xFF0C;&#x672C;&#x4E66;&#x7EA6;&#x5B9A;&#xFF0C;&#x5C06;&#x5728;Widget&#x5C5E;&#x6027;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x7684;&#x7EC4;&#x4EF6;&#x7EDF;&#x79F0;&#x4E3A;&#x201D;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x201C;&#xFF0C;&#x800C;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x6700;&#x660E;&#x663E;&#x7684;&#x4E00;&#x4E2A;&#x7279;&#x5F81;&#x5C31;&#x662F;&#x5B83;&#x4F1A;&#x5728;&#x5185;&#x90E8;&#x81EA;&#x7BA1;&#x7406;<code>AnimationController</code>&#x3002;&#x6211;&#x4EEC;&#x77E5;&#x9053;&#xFF0C;&#x4E3A;&#x4E86;&#x65B9;&#x4FBF;&#x4F7F;&#x7528;&#x8005;&#x53EF;&#x4EE5;&#x81EA;&#x5B9A;&#x4E49;&#x52A8;&#x753B;&#x7684;&#x66F2;&#x7EBF;&#x3001;&#x6267;&#x884C;&#x65F6;&#x957F;&#x3001;&#x65B9;&#x5411;&#x7B49;&#xFF0C;&#x5728;&#x524D;&#x9762;&#x4ECB;&#x7ECD;&#x8FC7;&#x7684;&#x52A8;&#x753B;&#x5C01;&#x88C5;&#x65B9;&#x6CD5;&#x4E2D;&#xFF0C;&#x901A;&#x5E38;&#x90FD;&#x9700;&#x8981;&#x4F7F;&#x7528;&#x8005;&#x81EA;&#x5DF1;&#x63D0;&#x4F9B;&#x4E00;&#x4E2A;<code>AnimationController</code>&#x5BF9;&#x8C61;&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#x8FD9;&#x4E9B;&#x5C5E;&#x6027;&#x503C;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x5982;&#x6B64;&#x4E00;&#x6765;&#xFF0C;&#x4F7F;&#x7528;&#x8005;&#x5C31;&#x5FC5;&#x987B;&#x5F97;&#x624B;&#x52A8;&#x7BA1;&#x7406;<code>AnimationController</code>&#xFF0C;&#x8FD9;&#x53C8;&#x4F1A;&#x589E;&#x52A0;&#x4F7F;&#x7528;&#x7684;&#x590D;&#x6742;&#x6027;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x5982;&#x679C;&#x4E5F;&#x80FD;&#x5C06;<code>AnimationController</code>&#x8FDB;&#x884C;&#x5C01;&#x88C5;&#xFF0C;&#x5219;&#x4F1A;&#x5927;&#x5927;&#x63D0;&#x9AD8;&#x52A8;&#x753B;&#x7EC4;&#x4EF6;&#x7684;&#x6613;&#x7528;&#x6027;&#x3002;</p>
<h2 id="971-&#x81EA;&#x5B9A;&#x4E49;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;">9.7.1 &#x81EA;&#x5B9A;&#x4E49;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;</h2>
<p>&#x6211;&#x4EEC;&#x8981;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;<code>AnimatedDecoratedBox</code>&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x5728;<code>decoration</code>&#x5C5E;&#x6027;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#xFF0C;&#x4ECE;&#x65E7;&#x72B6;&#x6001;&#x53D8;&#x6210;&#x65B0;&#x72B6;&#x6001;&#x7684;&#x8FC7;&#x7A0B;&#x53EF;&#x4EE5;&#x6267;&#x884C;&#x4E00;&#x4E2A;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x3002;&#x6839;&#x636E;&#x524D;&#x9762;&#x6240;&#x5B66;&#x7684;&#x77E5;&#x8BC6;&#xFF0C;&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E86;&#x4E00;&#x4E2A;<code>AnimatedDecoratedBox1</code>&#x7EC4;&#x4EF6;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">AnimatedDecoratedBox1</span> <span class="token keyword">extends</span> <span class="token class-name">StatefulWidget</span> <span class="token punctuation">{</span>
  <span class="token function">AnimatedDecoratedBox1</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    Key key<span class="token punctuation">,</span>
    <span class="token metadata symbol">@required</span> <span class="token keyword">this</span><span class="token punctuation">.</span>decoration<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>child<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>curve <span class="token operator">=</span> Curves<span class="token punctuation">.</span>linear<span class="token punctuation">,</span>
    <span class="token metadata symbol">@required</span> <span class="token keyword">this</span><span class="token punctuation">.</span>duration<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>reverseDuration<span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">final</span> BoxDecoration decoration<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Widget child<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Duration duration<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Curve curve<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Duration reverseDuration<span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  _AnimatedDecoratedBox1State <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">_AnimatedDecoratedBox1State</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">_AnimatedDecoratedBox1State</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>AnimatedDecoratedBox1<span class="token operator">&gt;</span>
    <span class="token keyword">with</span> SingleTickerProviderStateMixin <span class="token punctuation">{</span>
  <span class="token metadata symbol">@protected</span>
  AnimationController <span class="token keyword">get</span> controller <span class="token operator">=</span><span class="token operator">&gt;</span> _controller<span class="token punctuation">;</span>
  AnimationController _controller<span class="token punctuation">;</span>

  Animation<span class="token operator">&lt;</span>double<span class="token operator">&gt;</span> <span class="token keyword">get</span> animation <span class="token operator">=</span><span class="token operator">&gt;</span> _animation<span class="token punctuation">;</span>
  Animation<span class="token operator">&lt;</span>double<span class="token operator">&gt;</span> _animation<span class="token punctuation">;</span>

  DecorationTween _tween<span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">AnimatedBuilder</span><span class="token punctuation">(</span>
      animation<span class="token punctuation">:</span> _animation<span class="token punctuation">,</span>
      builder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">,</span> child<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token function">DecoratedBox</span><span class="token punctuation">(</span>
          decoration<span class="token punctuation">:</span> _tween<span class="token punctuation">.</span><span class="token function">animate</span><span class="token punctuation">(</span>_animation<span class="token punctuation">)</span><span class="token punctuation">.</span>value<span class="token punctuation">,</span>
          child<span class="token punctuation">:</span> child<span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>child<span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">initState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">initState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    _controller <span class="token operator">=</span> <span class="token function">AnimationController</span><span class="token punctuation">(</span>
      duration<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>duration<span class="token punctuation">,</span>
      reverseDuration<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>reverseDuration<span class="token punctuation">,</span>
      vsync<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
    _tween <span class="token operator">=</span> <span class="token function">DecorationTween</span><span class="token punctuation">(</span>begin<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>decoration<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">_updateCurve</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">void</span> <span class="token function">_updateCurve</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>widget<span class="token punctuation">.</span>curve <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
      _animation <span class="token operator">=</span> <span class="token function">CurvedAnimation</span><span class="token punctuation">(</span>parent<span class="token punctuation">:</span> _controller<span class="token punctuation">,</span> curve<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>curve<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">else</span>
      _animation <span class="token operator">=</span> _controller<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>


  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">didUpdateWidget</span><span class="token punctuation">(</span>AnimatedDecoratedBox1 oldWidget<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">didUpdateWidget</span><span class="token punctuation">(</span>oldWidget<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>widget<span class="token punctuation">.</span>curve <span class="token operator">!=</span> oldWidget<span class="token punctuation">.</span>curve<span class="token punctuation">)</span>
      <span class="token function">_updateCurve</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    _controller<span class="token punctuation">.</span>duration <span class="token operator">=</span> widget<span class="token punctuation">.</span>duration<span class="token punctuation">;</span>
    _controller<span class="token punctuation">.</span>reverseDuration <span class="token operator">=</span> widget<span class="token punctuation">.</span>reverseDuration<span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>widget<span class="token punctuation">.</span>decoration<span class="token operator">!=</span> <span class="token punctuation">(</span>_tween<span class="token punctuation">.</span>end <span class="token operator">?</span><span class="token operator">?</span> _tween<span class="token punctuation">.</span>begin<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
      _tween
        <span class="token punctuation">.</span><span class="token punctuation">.</span>begin <span class="token operator">=</span> _tween<span class="token punctuation">.</span><span class="token function">evaluate</span><span class="token punctuation">(</span>_animation<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span>end <span class="token operator">=</span> widget<span class="token punctuation">.</span>decoration<span class="token punctuation">;</span>
      _controller
        <span class="token punctuation">.</span><span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token number">0.0</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token function">forward</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">dispose</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    _controller<span class="token punctuation">.</span><span class="token function">dispose</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">dispose</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x6765;&#x4F7F;&#x7528;<code>AnimatedDecoratedBox1</code>&#x6765;&#x5B9E;&#x73B0;&#x6309;&#x94AE;&#x70B9;&#x51FB;&#x540E;&#x80CC;&#x666F;&#x8272;&#x4ECE;&#x84DD;&#x8272;&#x8FC7;&#x6E21;&#x5230;&#x7EA2;&#x8272;&#x7684;&#x6548;&#x679C;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">Color _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">;</span>
<span class="token keyword">var</span> duration <span class="token operator">=</span> <span class="token function">Duration</span><span class="token punctuation">(</span>seconds<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token comment">//&#x7701;&#x7565;&#x65E0;&#x5173;&#x4EE3;&#x7801;</span>
<span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span>
  duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
  decoration<span class="token punctuation">:</span> <span class="token function">BoxDecoration</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> _decorationColor<span class="token punctuation">)</span><span class="token punctuation">,</span>
  child<span class="token punctuation">:</span> <span class="token function">FlatButton</span><span class="token punctuation">(</span>
    onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>red<span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
      <span class="token string">&quot;AnimatedDecoratedBox&quot;</span><span class="token punctuation">,</span>
      style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x70B9;&#x51FB;&#x524D;&#x6548;&#x679C;&#x5982;&#x56FE;9-8&#x6240;&#x793A;&#xFF0C;&#x70B9;&#x51FB;&#x540E;&#x622A;&#x53D6;&#x4E86;&#x8FC7;&#x6E21;&#x8FC7;&#x7A0B;&#x7684;&#x4E00;&#x5E27;&#x5982;&#x56FE;9-9&#x6240;&#x793A;&#xFF1A; <img src="https://pcdn.flutterchina.club/imgs/9-8.png?lastModify=1565699462" alt="img"><img src="https://pcdn.flutterchina.club/imgs/9-9.png?lastModify=1565699462" alt="img"></p>
<p>&#x70B9;&#x51FB;&#x540E;&#xFF0C;&#x6309;&#x94AE;&#x80CC;&#x666F;&#x8272;&#x4F1A;&#x4ECE;&#x84DD;&#x8272;&#x5411;&#x7EA2;&#x8272;&#x8FC7;&#x6E21;&#xFF0C;&#x56FE;9-9&#x662F;&#x8FC7;&#x6E21;&#x8FC7;&#x7A0B;&#x4E2D;&#x7684;&#x4E00;&#x5E27;&#xFF0C;&#x6709;&#x70B9;&#x504F;&#x7D2B;&#x8272;&#xFF0C;&#x6574;&#x4E2A;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x7ED3;&#x675F;&#x540E;&#x80CC;&#x666F;&#x4F1A;&#x53D8;&#x4E3A;&#x7EA2;&#x8272;&#x3002;</p>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x867D;&#x7136;&#x5B9E;&#x73B0;&#x4E86;&#x6211;&#x4EEC;&#x671F;&#x671B;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x4F46;&#x662F;&#x4EE3;&#x7801;&#x5374;&#x6BD4;&#x8F83;&#x590D;&#x6742;&#x3002;&#x7A0D;&#x52A0;&#x601D;&#x8003;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x53D1;&#x73B0;&#xFF0C;<code>AnimationController</code>&#x7684;&#x7BA1;&#x7406;&#x4EE5;&#x53CA;Tween&#x66F4;&#x65B0;&#x90E8;&#x5206;&#x7684;&#x4EE3;&#x7801;&#x90FD;&#x662F;&#x53EF;&#x4EE5;&#x62BD;&#x8C61;&#x51FA;&#x6765;&#x7684;&#xFF0C;&#x5982;&#x679C;&#x6211;&#x4EEC;&#x8FD9;&#x4E9B;&#x901A;&#x7528;&#x903B;&#x8F91;&#x5C01;&#x88C5;&#x6210;&#x57FA;&#x7C7B;&#xFF0C;&#x90A3;&#x4E48;&#x8981;&#x5B9E;&#x73B0;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x53EA;&#x9700;&#x8981;&#x7EE7;&#x627F;&#x8FD9;&#x4E9B;&#x57FA;&#x7C7B;&#xFF0C;&#x7136;&#x540E;&#x5B9A;&#x5236;&#x81EA;&#x8EAB;&#x4E0D;&#x540C;&#x7684;&#x4EE3;&#x7801;&#xFF08;&#x6BD4;&#x5982;&#x52A8;&#x753B;&#x6BCF;&#x4E00;&#x5E27;&#x7684;&#x6784;&#x5EFA;&#x65B9;&#x6CD5;&#xFF09;&#x5373;&#x53EF;&#xFF0C;&#x8FD9;&#x6837;&#x5C06;&#x4F1A;&#x7B80;&#x5316;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x65B9;&#x4FBF;&#x5F00;&#x53D1;&#x8005;&#x6765;&#x5B9E;&#x73B0;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x7684;&#x5C01;&#x88C5;&#xFF0C;Flutter&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>ImplicitlyAnimatedWidget</code>&#x62BD;&#x8C61;&#x7C7B;&#xFF0C;&#x5B83;&#x7EE7;&#x627F;&#x81EA;StatefulWidget&#xFF0C;&#x540C;&#x65F6;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x5BF9;&#x5E94;&#x7684;<code>ImplicitlyAnimatedWidgetState</code>&#x7C7B;&#xFF0C;<code>AnimationController</code>&#x7684;&#x7BA1;&#x7406;&#x5C31;&#x5728;<code>ImplicitlyAnimatedWidgetState</code>&#x7C7B;&#x4E2D;&#x3002;&#x5F00;&#x53D1;&#x8005;&#x5982;&#x679C;&#x8981;&#x5C01;&#x88C5;&#x52A8;&#x753B;&#xFF0C;&#x53EA;&#x9700;&#x8981;&#x5206;&#x522B;&#x7EE7;&#x627F;<code>ImplicitlyAnimatedWidget</code>&#x548C;<code>ImplicitlyAnimatedWidgetState</code>&#x7C7B;&#x5373;&#x53EF;&#xFF0C;&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x6F14;&#x793A;&#x4E00;&#x4E0B;&#x5177;&#x4F53;&#x5982;&#x4F55;&#x5B9E;&#x73B0;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5206;&#x4E24;&#x6B65;&#x5B9E;&#x73B0;&#xFF1A;</p>
<ol>
<li><p>&#x7EE7;&#x627F;<code>ImplicitlyAnimatedWidget</code>&#x7C7B;&#x3002;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">AnimatedDecoratedBox</span> <span class="token keyword">extends</span> <span class="token class-name">ImplicitlyAnimatedWidget</span> <span class="token punctuation">{</span>
  <span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    Key key<span class="token punctuation">,</span>
    <span class="token metadata symbol">@required</span> <span class="token keyword">this</span><span class="token punctuation">.</span>decoration<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>child<span class="token punctuation">,</span>
    Curve curve <span class="token operator">=</span> Curves<span class="token punctuation">.</span>linear<span class="token punctuation">,</span> <span class="token comment">//&#x52A8;&#x753B;&#x66F2;&#x7EBF;</span>
    <span class="token metadata symbol">@required</span> Duration duration<span class="token punctuation">,</span> <span class="token comment">// &#x6B63;&#x5411;&#x52A8;&#x753B;&#x6267;&#x884C;&#x65F6;&#x957F;</span>
    Duration reverseDuration<span class="token punctuation">,</span> <span class="token comment">// &#x53CD;&#x5411;&#x52A8;&#x753B;&#x6267;&#x884C;&#x65F6;&#x957F;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token keyword">super</span><span class="token punctuation">(</span>
          key<span class="token punctuation">:</span> key<span class="token punctuation">,</span>
          curve<span class="token punctuation">:</span> curve<span class="token punctuation">,</span>
          duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
          reverseDuration<span class="token punctuation">:</span> reverseDuration<span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">final</span> BoxDecoration decoration<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Widget child<span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  _AnimatedDecoratedBoxState <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">_AnimatedDecoratedBoxState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5176;&#x4E2D;<code>curve</code>&#x3001;<code>duration</code>&#x3001;<code>reverseDuration</code>&#x4E09;&#x4E2A;&#x5C5E;&#x6027;&#x5728;<code>ImplicitlyAnimatedWidget</code>&#x4E2D;&#x5DF2;&#x5B9A;&#x4E49;&#x3002; &#x53EF;&#x4EE5;&#x770B;&#x5230;<code>AnimatedDecoratedBox</code>&#x7C7B;&#x548C;&#x666E;&#x901A;&#x7EE7;&#x627F;&#x81EA;<code>StatefulWidget</code>&#x7684;&#x7C7B;&#x6CA1;&#x6709;&#x4EC0;&#x4E48;&#x4E0D;&#x540C;&#x3002;</p>
</li>
<li><p>State&#x7C7B;&#x7EE7;&#x627F;&#x81EA;<code>AnimatedWidgetBaseState</code>&#xFF08;&#x8BE5;&#x7C7B;&#x7EE7;&#x627F;&#x81EA;<code>ImplicitlyAnimatedWidgetState</code>&#x7C7B;&#xFF09;&#x3002;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">_AnimatedDecoratedBoxState</span>
    <span class="token keyword">extends</span> <span class="token class-name">AnimatedWidgetBaseState</span><span class="token operator">&lt;</span>AnimatedDecoratedBox<span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  DecorationTween _decoration<span class="token punctuation">;</span> <span class="token comment">//&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;Tween</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">DecoratedBox</span><span class="token punctuation">(</span>
      decoration<span class="token punctuation">:</span> _decoration<span class="token punctuation">.</span><span class="token function">evaluate</span><span class="token punctuation">(</span>animation<span class="token punctuation">)</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> widget<span class="token punctuation">.</span>child<span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token metadata symbol">@override</span>
  <span class="token keyword">void</span> <span class="token function">forEachTween</span><span class="token punctuation">(</span>visitor<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// &#x5728;&#x9700;&#x8981;&#x66F4;&#x65B0;Tween&#x65F6;&#xFF0C;&#x57FA;&#x7C7B;&#x4F1A;&#x8C03;&#x7528;&#x6B64;&#x65B9;&#x6CD5;</span>
    _decoration <span class="token operator">=</span> <span class="token function">visitor</span><span class="token punctuation">(</span>_decoration<span class="token punctuation">,</span> widget<span class="token punctuation">.</span>decoration<span class="token punctuation">,</span>
        <span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">DecorationTween</span><span class="token punctuation">(</span>begin<span class="token punctuation">:</span> value<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E86;<code>build</code>&#x548C;<code>forEachTween</code>&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x3002;&#x5728;&#x52A8;&#x753B;&#x6267;&#x884C;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x6BCF;&#x4E00;&#x5E27;&#x90FD;&#x4F1A;&#x8C03;&#x7528;<code>build</code>&#x65B9;&#x6CD5;&#xFF08;&#x8C03;&#x7528;&#x903B;&#x8F91;&#x5728;<code>ImplicitlyAnimatedWidgetState</code>&#x4E2D;&#xFF09;&#xFF0C;&#x6240;&#x4EE5;&#x5728;<code>build</code>&#x65B9;&#x6CD5;&#x4E2D;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x6784;&#x5EFA;&#x6BCF;&#x4E00;&#x5E27;&#x7684;<code>DecoratedBox</code>&#x72B6;&#x6001;&#xFF0C;&#x56E0;&#x6B64;&#x5F97;&#x7B97;&#x51FA;&#x6BCF;&#x4E00;&#x5E27;&#x7684;<code>decoration</code> &#x72B6;&#x6001;&#xFF0C;&#x8FD9;&#x4E2A;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>_decoration.evaluate(animation)</code> &#x6765;&#x7B97;&#x51FA;&#xFF0C;&#x5176;&#x4E2D;<code>animation</code>&#x662F;<code>ImplicitlyAnimatedWidgetState</code>&#x57FA;&#x7C7B;&#x4E2D;&#x5B9A;&#x4E49;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;<code>_decoration</code>&#x662F;&#x6211;&#x4EEC;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x4E00;&#x4E2A;<code>DecorationTween</code>&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x90A3;&#x4E48;&#x73B0;&#x5728;&#x7684;&#x95EE;&#x9898;&#x5C31;&#x662F;&#x5B83;&#x662F;&#x5728;&#x4EC0;&#x4E48;&#x65F6;&#x5019;&#x88AB;&#x8D4B;&#x503C;&#x7684;&#x5462;&#xFF1F;&#x8981;&#x56DE;&#x7B54;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x5F97;&#x641E;&#x6E05;&#x695A;&#x4EC0;&#x4E48;&#x65F6;&#x5019;&#x9700;&#x8981;&#x5BF9;<code>_decoration</code>&#x8D4B;&#x503C;&#x3002;&#x6211;&#x4EEC;&#x77E5;&#x9053;<code>_decoration</code>&#x662F;&#x4E00;&#x4E2A;Tween&#xFF0C;&#x800C;Tween&#x7684;&#x4E3B;&#x8981;&#x804C;&#x8D23;&#x5C31;&#x662F;&#x5B9A;&#x4E49;&#x52A8;&#x753B;&#x7684;&#x8D77;&#x59CB;&#x72B6;&#x6001;&#xFF08;begin&#xFF09;&#x548C;&#x7EC8;&#x6B62;&#x72B6;&#x6001;(end)&#x3002;&#x5BF9;&#x4E8E;<code>AnimatedDecoratedBox</code>&#x6765;&#x8BF4;&#xFF0C;<code>decoration</code>&#x7684;&#x7EC8;&#x6B62;&#x72B6;&#x6001;&#x5C31;&#x662F;&#x7528;&#x6237;&#x4F20;&#x7ED9;&#x5B83;&#x7684;&#x503C;&#xFF0C;&#x800C;&#x8D77;&#x59CB;&#x72B6;&#x6001;&#x662F;&#x4E0D;&#x786E;&#x5B9A;&#x7684;&#xFF0C;&#x6709;&#x4EE5;&#x4E0B;&#x4E24;&#x79CD;&#x60C5;&#x51B5;&#xFF1A;</p>
<ol>
<li><code>AnimatedDecoratedBox</code>&#x9996;&#x6B21;build&#xFF0C;&#x6B64;&#x65F6;&#x76F4;&#x63A5;&#x5C06;&#x5176;<code>decoration</code>&#x503C;&#x7F6E;&#x4E3A;&#x8D77;&#x59CB;&#x72B6;&#x6001;&#xFF0C;&#x5373;<code>_decoration</code>&#x503C;&#x4E3A;<code>DecorationTween(begin: decoration)</code> &#x3002;</li>
<li><code>AnimatedDecoratedBox</code>&#x7684;<code>decoration</code>&#x66F4;&#x65B0;&#x65F6;&#xFF0C;&#x5219;&#x8D77;&#x59CB;&#x72B6;&#x6001;&#x4E3A;<code>_decoration.animate(animation)</code>&#xFF0C;&#x5373;<code>_decoration</code>&#x503C;&#x4E3A;<code>DecorationTween(begin: _decoration.animate(animation)&#xFF0C;end:decoration)</code>&#x3002;</li>
</ol>
</li>
</ol>
<p>&#x73B0;&#x5728;<code>forEachTween</code>&#x7684;&#x4F5C;&#x7528;&#x5C31;&#x5F88;&#x660E;&#x663E;&#x4E86;&#xFF0C;&#x5B83;&#x6B63;&#x662F;&#x7528;&#x4E8E;&#x6765;&#x66F4;&#x65B0;Tween&#x7684;&#x521D;&#x59CB;&#x503C;&#x7684;&#xFF0C;&#x5728;&#x4E0A;&#x8FF0;&#x4E24;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#x4F1A;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x800C;&#x5F00;&#x53D1;&#x8005;&#x53EA;&#x9700;&#x91CD;&#x5199;&#x6B64;&#x65B9;&#x6CD5;&#xFF0C;&#x5E76;&#x5728;&#x6B64;&#x65B9;&#x6CD5;&#x4E2D;&#x66F4;&#x65B0;Tween&#x7684;&#x8D77;&#x59CB;&#x72B6;&#x6001;&#x503C;&#x5373;&#x53EF;&#x3002;&#x800C;&#x4E00;&#x4E9B;&#x66F4;&#x65B0;&#x7684;&#x903B;&#x8F91;&#x88AB;&#x5C4F;&#x853D;&#x5728;&#x4E86;<code>visitor</code>&#x56DE;&#x8C03;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8981;&#x8C03;&#x7528;&#x5B83;&#x5E76;&#x7ED9;&#x5B83;&#x4F20;&#x9012;&#x6B63;&#x786E;&#x7684;&#x53C2;&#x6570;&#x5373;&#x53EF;&#xFF0C;<code>visitor</code>&#x65B9;&#x6CD5;&#x7B7E;&#x540D;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">   Tween <span class="token function">visitor</span><span class="token punctuation">(</span>
     Tween<span class="token operator">&lt;</span><span class="token keyword">dynamic</span><span class="token operator">&gt;</span> tween<span class="token punctuation">,</span> <span class="token comment">//&#x5F53;&#x524D;&#x7684;tween&#xFF0C;&#x7B2C;&#x4E00;&#x6B21;&#x8C03;&#x7528;&#x4E3A;null</span>
     <span class="token keyword">dynamic</span> targetValue<span class="token punctuation">,</span> <span class="token comment">// &#x7EC8;&#x6B62;&#x72B6;&#x6001;</span>
     TweenConstructor<span class="token operator">&lt;</span><span class="token keyword">dynamic</span><span class="token operator">&gt;</span> constructor&#xFF0C;<span class="token comment">//Tween&#x6784;&#x9020;&#x5668;&#xFF0C;&#x5728;&#x4E0A;&#x8FF0;&#x4E09;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#x4F1A;&#x88AB;&#x8C03;&#x7528;&#x4EE5;&#x66F4;&#x65B0;tween</span>
   <span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x901A;&#x8FC7;&#x7EE7;&#x627F;<code>ImplicitlyAnimatedWidget</code>&#x548C;<code>ImplicitlyAnimatedWidgetState</code>&#x7C7B;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x7684;&#x5B9E;&#x73B0;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x7684;&#x5C01;&#x88C5;&#xFF0C;&#x8FD9;&#x548C;&#x6211;&#x4EEC;&#x7EAF;&#x624B;&#x5DE5;&#x5B9E;&#x73B0;&#x76F8;&#x6BD4;&#xFF0C;&#x4EE3;&#x7801;&#x7B80;&#x5316;&#x4E86;&#x5F88;&#x591A;&#x3002;</p>
<blockquote>
<p>&#x5982;&#x679C;&#x8BFB;&#x8005;&#x8FD8;&#x6709;&#x7591;&#x60D1;&#xFF0C;&#x5EFA;&#x8BAE;&#x67E5;&#x770B;<code>ImplicitlyAnimatedWidgetState</code>&#x7684;&#x6E90;&#x7801;&#x5E76;&#x7ED3;&#x5408;&#x672C;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x5BF9;&#x6BD4;&#x7406;&#x89E3;&#x3002;</p>
</blockquote>
<h3 id="&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x7684;&#x53CD;&#x5411;&#x52A8;&#x753B;">&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x7684;&#x53CD;&#x5411;&#x52A8;&#x753B;</h3>
<p>&#x5728;&#x4F7F;&#x7528;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8981;&#x5728;&#x6539;&#x53D8;&#x4E00;&#x4E9B;&#x5C5E;&#x6027;&#x503C;&#x540E;&#x91CD;&#x65B0;build&#x7EC4;&#x4EF6;&#x5373;&#x53EF;&#xFF0C;&#x6240;&#x4EE5;&#x8981;&#x5B9E;&#x73B0;&#x72B6;&#x6001;&#x53CD;&#x5411;&#x8FC7;&#x6E21;&#xFF0C;&#x53EA;&#x9700;&#x8981;&#x5C06;&#x524D;&#x540E;&#x72B6;&#x6001;&#x503C;&#x4E92;&#x6362;&#x5373;&#x53EF;&#x5B9E;&#x73B0;&#xFF0C;&#x8FD9;&#x672C;&#x6765;&#x662F;&#x4E0D;&#x9700;&#x8981;&#x518D;&#x6D6A;&#x8D39;&#x7B14;&#x58A8;&#x7684;&#x3002;&#x4F46;&#x662F;<code>ImplicitlyAnimatedWidget</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E2D;&#x5374;&#x6709;&#x4E00;&#x4E2A;<code>reverseDuration</code>&#x5C5E;&#x6027;&#x7528;&#x4E8E;&#x8BBE;&#x7F6E;&#x53CD;&#x5411;&#x52A8;&#x753B;&#x7684;&#x6267;&#x884C;&#x65F6;&#x957F;&#xFF0C;&#x8FD9;&#x8C8C;&#x4F3C;&#x5728;&#x544A;&#x8BC9;&#x8BFB;&#x8005;<code>ImplicitlyAnimatedWidget</code>&#x672C;&#x8EAB;&#x4E5F;&#x63D0;&#x4F9B;&#x4E86;&#x6267;&#x884C;&#x53CD;&#x5411;&#x52A8;&#x753B;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x4E8E;&#x662F;&#x7B14;&#x8005;&#x67E5;&#x770B;&#x4E86;<code>ImplicitlyAnimatedWidgetState</code>&#x6E90;&#x7801;&#x5E76;&#x672A;&#x53D1;&#x73B0;&#x6709;&#x6267;&#x884C;&#x53CD;&#x5411;&#x52A8;&#x753B;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x552F;&#x4E00;&#x6709;&#x7528;&#x7684;&#x662F;&#x5B83;&#x66B4;&#x9732;&#x4E86;&#x63A7;&#x5236;&#x52A8;&#x753B;&#x7684;<code>controller</code>&#x3002;&#x6240;&#x4EE5;&#x5982;&#x679C;&#x8981;&#x8BA9;<code>reverseDuration</code>&#x751F;&#x6548;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x80FD;&#x5148;&#x83B7;&#x53D6;<code>controller</code>&#xFF0C;&#x7136;&#x540E;&#x518D;&#x901A;&#x8FC7;<code>controller.reverse()</code>&#x6765;&#x542F;&#x52A8;&#x53CD;&#x5411;&#x52A8;&#x753B;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x5728;&#x4E0A;&#x9762;&#x793A;&#x4F8B;&#x7684;&#x57FA;&#x7840;&#x4E0A;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x5FAA;&#x73AF;&#x7684;&#x70B9;&#x51FB;&#x80CC;&#x666F;&#x989C;&#x8272;&#x53D8;&#x6362;&#x6548;&#x679C;&#xFF0C;&#x8981;&#x6C42;&#x4ECE;&#x84DD;&#x8272;&#x53D8;&#x4E3A;&#x7EA2;&#x8272;&#x65F6;&#x52A8;&#x753B;&#x6267;&#x884C;&#x65F6;&#x95F4;&#x4E3A;400ms&#xFF0C;&#x4ECE;&#x7EA2;&#x53D8;&#x84DD;&#x4E3A;2s&#xFF0C;&#x5982;&#x679C;&#x8981;&#x4F7F;<code>reverseDuration</code>&#x751F;&#x6548;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x8FD9;&#x4E48;&#x505A;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span>
  duration<span class="token punctuation">:</span> <span class="token function">Duration</span><span class="token punctuation">(</span> milliseconds<span class="token punctuation">:</span> <span class="token number">400</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  decoration<span class="token punctuation">:</span> <span class="token function">BoxDecoration</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> _decorationColor<span class="token punctuation">)</span><span class="token punctuation">,</span>
  reverseDuration<span class="token punctuation">:</span> <span class="token function">Duration</span><span class="token punctuation">(</span>seconds<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  child<span class="token punctuation">:</span> <span class="token function">Builder</span><span class="token punctuation">(</span>builder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">FlatButton</span><span class="token punctuation">(</span>
      onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>_decorationColor <span class="token operator">==</span> Colors<span class="token punctuation">.</span>red<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          ImplicitlyAnimatedWidgetState _state <span class="token operator">=</span>
              context<span class="token punctuation">.</span>findAncestorStateOfType<span class="token operator">&lt;</span>ImplicitlyAnimatedWidgetState<span class="token operator">&gt;</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
           <span class="token comment">// &#x901A;&#x8FC7;controller&#x6765;&#x542F;&#x52A8;&#x53CD;&#x5411;&#x52A8;&#x753B;</span>
          _state<span class="token punctuation">.</span>controller<span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">// &#x7ECF;&#x9A8C;&#x8BC1;&#x5FC5;&#x987B;&#x8C03;&#x7528;setState&#x6765;&#x89E6;&#x53D1;rebuild&#xFF0C;&#x5426;&#x5219;&#x72B6;&#x6001;&#x540C;&#x6B65;&#x4F1A;&#x6709;&#x95EE;&#x9898;</span>
            <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
              _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
          <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
          <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>red<span class="token punctuation">;</span>
          <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
        <span class="token string">&quot;AnimatedDecoratedBox toggle&quot;</span><span class="token punctuation">,</span>
        style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x5B9E;&#x9645;&#x4E0A;&#x662F;&#x975E;&#x5E38;&#x7CDF;&#x7CD5;&#x4E14;&#x6CA1;&#x5FC5;&#x8981;&#x7684;&#xFF0C;&#x5B83;&#x9700;&#x8981;&#x6211;&#x4EEC;&#x4E86;&#x89E3;<code>ImplicitlyAnimatedWidgetState</code>&#x5185;&#x90E8;&#x5B9E;&#x73B0;&#xFF0C;&#x5E76;&#x4E14;&#x8981;&#x624B;&#x52A8;&#x53BB;&#x542F;&#x52A8;&#x53CD;&#x5411;&#x52A8;&#x753B;&#x3002;&#x6211;&#x4EEC;&#x5B8C;&#x5168;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5982;&#x4E0B;&#x4EE3;&#x7801;&#x5B9E;&#x73B0;&#x76F8;&#x540C;&#x7684;&#x6548;&#x679C;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span>
  duration<span class="token punctuation">:</span> <span class="token function">Duration</span><span class="token punctuation">(</span>
      milliseconds<span class="token punctuation">:</span> _decorationColor <span class="token operator">==</span> Colors<span class="token punctuation">.</span>red <span class="token operator">?</span> <span class="token number">400</span> <span class="token punctuation">:</span> <span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  decoration<span class="token punctuation">:</span> <span class="token function">BoxDecoration</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> _decorationColor<span class="token punctuation">)</span><span class="token punctuation">,</span>
  child<span class="token punctuation">:</span> <span class="token function">Builder</span><span class="token punctuation">(</span>builder<span class="token punctuation">:</span> <span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">FlatButton</span><span class="token punctuation">(</span>
      onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          _decorationColor <span class="token operator">=</span> _decorationColor <span class="token operator">==</span> Colors<span class="token punctuation">.</span>blue
              <span class="token operator">?</span> Colors<span class="token punctuation">.</span>red
              <span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
        <span class="token string">&quot;AnimatedDecoratedBox toggle&quot;</span><span class="token punctuation">,</span>
        style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x8FD9;&#x6837;&#x7684;&#x4EE3;&#x7801;&#x662F;&#x4E0D;&#x662F;&#x4F18;&#x96C5;&#x7684;&#x591A;&#xFF01;&#x90A3;&#x4E48;&#x73B0;&#x5728;&#x95EE;&#x9898;&#x6765;&#x4E86;&#xFF0C;&#x4E3A;&#x4EC0;&#x4E48;<code>ImplicitlyAnimatedWidgetState</code>&#x8981;&#x63D0;&#x4F9B;&#x4E00;&#x4E2A;<code>reverseDuration</code>&#x53C2;&#x6570;&#x5462;&#xFF1F;&#x7B14;&#x8005;&#x4ED4;&#x7EC6;&#x7814;&#x7A76;&#x4E86;<code>ImplicitlyAnimatedWidgetState</code>&#x7684;&#x5B9E;&#x73B0;&#xFF0C;&#x53D1;&#x73B0;&#x552F;&#x4E00;&#x7684;&#x89E3;&#x91CA;&#x5C31;&#x662F;&#x8BE5;&#x53C2;&#x6570;&#x5E76;&#x975E;&#x662F;&#x7ED9;<code>ImplicitlyAnimatedWidgetState</code>&#x7528;&#x7684;&#xFF0C;&#x800C;&#x662F;&#x7ED9;&#x5B50;&#x7C7B;&#x7528;&#x7684;&#xFF01;&#x539F;&#x56E0;&#x6B63;&#x5982;&#x6211;&#x4EEC;&#x524D;&#x9762;&#x8BF4;&#x7684;&#xFF0C;&#x8981;&#x4F7F;<code>reverseDuration</code> &#x6709;&#x7528;&#x5C31;&#x5FC5;&#x987B;&#x5F97;&#x83B7;&#x53D6;<code>controller</code> &#x5C5E;&#x6027;&#x6765;&#x624B;&#x52A8;&#x542F;&#x52A8;&#x53CD;&#x5411;&#x52A8;&#x753B;&#xFF0C;<code>ImplicitlyAnimatedWidgetState</code>&#x4E2D;&#x7684;<code>controller</code> &#x5C5E;&#x6027;&#x662F;&#x4E00;&#x4E2A;&#x4FDD;&#x62A4;&#x5C5E;&#x6027;&#xFF0C;&#x5B9A;&#x4E49;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"> <span class="token metadata symbol">@protected</span>
  AnimationController <span class="token keyword">get</span> controller <span class="token operator">=</span><span class="token operator">&gt;</span> _controller<span class="token punctuation">;</span>
</code></pre>
<p>&#x800C;&#x4FDD;&#x62A4;&#x5C5E;&#x6027;&#x539F;&#x5219;&#x4E0A;&#x53EA;&#x5E94;&#x8BE5;&#x5728;&#x5B50;&#x7C7B;&#x4E2D;&#x4F7F;&#x7528;&#xFF0C;&#x800C;&#x4E0D;&#x5E94;&#x8BE5;&#x50CF;&#x4E0A;&#x9762;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x4E00;&#x6837;&#x5728;&#x5916;&#x90E8;&#x4F7F;&#x7528;&#x3002;&#x7EFC;&#x4E0A;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5F97;&#x51FA;&#x4E24;&#x6761;&#x7ED3;&#x8BBA;&#xFF1A;</p>
<ol>
<li><p>&#x4F7F;&#x7528;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x65F6;&#x5982;&#x679C;&#x9700;&#x8981;&#x6267;&#x884C;&#x53CD;&#x5411;&#x52A8;&#x753B;&#x7684;&#x573A;&#x666F;&#xFF0C;&#x5E94;&#x5C3D;&#x91CF;&#x4F7F;&#x7528;&#x72B6;&#x6001;&#x4E92;&#x6362;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x800C;&#x4E0D;&#x5E94;&#x8BE5;&#x901A;&#x8FC7;&#x83B7;&#x53D6;<code>ImplicitlyAnimatedWidgetState</code>&#x4E2D;<code>controller</code>&#x7684;&#x65B9;&#x5F0F;&#x3002;</p>
</li>
<li><p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x7528;&#x4E0D;&#x5230;<code>reverseDuration</code> &#xFF0C;&#x90A3;&#x4E48;&#x6700;&#x597D;&#x5C31;&#x4E0D;&#x8981;&#x66B4;&#x9732;&#x6B64;&#x53C2;&#x6570;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x4E0A;&#x9762;&#x81EA;&#x5B9A;&#x4E49;&#x7684;<code>AnimatedDecoratedBox</code>&#x5B9A;&#x4E49;&#x4E2D;&#x5C31;&#x53EF;&#x4EE5;&#x53BB;&#x9664;<code>reverseDuration</code> &#x53EF;&#x9009;&#x53C2;&#x6570;&#xFF0C;&#x5982;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">AnimatedDecoratedBox</span> <span class="token keyword">extends</span> <span class="token class-name">ImplicitlyAnimatedWidget</span> <span class="token punctuation">{</span>
  <span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    Key key<span class="token punctuation">,</span>
    <span class="token metadata symbol">@required</span> <span class="token keyword">this</span><span class="token punctuation">.</span>decoration<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>child<span class="token punctuation">,</span>
    Curve curve <span class="token operator">=</span> Curves<span class="token punctuation">.</span>linear<span class="token punctuation">,</span>
    <span class="token metadata symbol">@required</span> Duration duration<span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token keyword">super</span><span class="token punctuation">(</span>
          key<span class="token punctuation">:</span> key<span class="token punctuation">,</span>
          curve<span class="token punctuation">:</span> curve<span class="token punctuation">,</span>
          duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
</li>
</ol>
<h2 id="972-flutter&#x9884;&#x7F6E;&#x7684;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;">9.7.2 Flutter&#x9884;&#x7F6E;&#x7684;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;</h2>
<p>Flutter SDK&#x4E2D;&#x4E5F;&#x9884;&#x7F6E;&#x4E86;&#x5F88;&#x591A;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#xFF0C;&#x5B9E;&#x73B0;&#x65B9;&#x5F0F;&#x548C;&#x5927;&#x90FD;&#x548C;<code>AnimatedDecoratedBox</code>&#x5DEE;&#x4E0D;&#x591A;&#xFF0C;&#x5982;&#x8868;9-1&#x6240;&#x793A;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>&#x7EC4;&#x4EF6;&#x540D;</th>
<th>&#x529F;&#x80FD;</th>
</tr>
</thead>
<tbody>
<tr>
<td>AnimatedPadding</td>
<td>&#x5728;padding&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x5230;&#x65B0;&#x72B6;&#x6001;</td>
</tr>
<tr>
<td>AnimatedPositioned</td>
<td>&#x914D;&#x5408;Stack&#x4E00;&#x8D77;&#x4F7F;&#x7528;&#xFF0C;&#x5F53;&#x5B9A;&#x4F4D;&#x72B6;&#x6001;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x5230;&#x65B0;&#x7684;&#x72B6;&#x6001;&#x3002;</td>
</tr>
<tr>
<td>AnimatedOpacity</td>
<td>&#x5728;&#x900F;&#x660E;&#x5EA6;opacity&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x5230;&#x65B0;&#x72B6;&#x6001;</td>
</tr>
<tr>
<td>AnimatedAlign</td>
<td>&#x5F53;<code>alignment</code>&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x5230;&#x65B0;&#x7684;&#x72B6;&#x6001;&#x3002;</td>
</tr>
<tr>
<td>AnimatedContainer</td>
<td>&#x5F53;Container&#x5C5E;&#x6027;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x4F1A;&#x6267;&#x884C;&#x8FC7;&#x6E21;&#x52A8;&#x753B;&#x5230;&#x65B0;&#x7684;&#x72B6;&#x6001;&#x3002;</td>
</tr>
<tr>
<td>AnimatedDefaultTextStyle</td>
<td>&#x5F53;&#x5B57;&#x4F53;&#x6837;&#x5F0F;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#xFF0C;&#x5B50;&#x7EC4;&#x4EF6;&#x4E2D;&#x7EE7;&#x627F;&#x4E86;&#x8BE5;&#x6837;&#x5F0F;&#x7684;&#x6587;&#x672C;&#x7EC4;&#x4EF6;&#x4F1A;&#x52A8;&#x6001;&#x8FC7;&#x6E21;&#x5230;&#x65B0;&#x6837;&#x5F0F;&#x3002;</td>
</tr>
</tbody>
</table>
<p><center>&#x8868;9-1&#xFF1A;Flutter&#x9884;&#x7F6E;&#x7684;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;</center>
&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x901A;&#x8FC7;&#x4E00;&#x4E2A;&#x793A;&#x4F8B;&#x6765;&#x611F;&#x53D7;&#x4E00;&#x4E0B;&#x8FD9;&#x4E9B;&#x9884;&#x7F6E;&#x7684;&#x52A8;&#x753B;&#x8FC7;&#x6E21;&#x7EC4;&#x4EF6;&#x6548;&#x679C;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">import</span> <span class="token string">&apos;package:flutter/material.dart&apos;</span><span class="token punctuation">;</span>

<span class="token keyword">class</span> <span class="token class-name">AnimatedWidgetsTest</span> <span class="token keyword">extends</span> <span class="token class-name">StatefulWidget</span> <span class="token punctuation">{</span>
  <span class="token metadata symbol">@override</span>
  _AnimatedWidgetsTestState <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token function">_AnimatedWidgetsTestState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">_AnimatedWidgetsTestState</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>AnimatedWidgetsTest<span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  double _padding <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
  <span class="token keyword">var</span> _align <span class="token operator">=</span> Alignment<span class="token punctuation">.</span>topRight<span class="token punctuation">;</span>
  double _height <span class="token operator">=</span> <span class="token number">100</span><span class="token punctuation">;</span>
  double _left <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
  Color _color <span class="token operator">=</span> Colors<span class="token punctuation">.</span>red<span class="token punctuation">;</span>
  TextStyle _style <span class="token operator">=</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>black<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Color _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">var</span> duration <span class="token operator">=</span> <span class="token function">Duration</span><span class="token punctuation">(</span>seconds<span class="token punctuation">:</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token function">SingleChildScrollView</span><span class="token punctuation">(</span>
      child<span class="token punctuation">:</span> <span class="token function">Column</span><span class="token punctuation">(</span>
        children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
          <span class="token function">RaisedButton</span><span class="token punctuation">(</span>
            onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
              <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                _padding <span class="token operator">=</span> <span class="token number">20</span><span class="token punctuation">;</span>
              <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">AnimatedPadding</span><span class="token punctuation">(</span>
              duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
              padding<span class="token punctuation">:</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span>_padding<span class="token punctuation">)</span><span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;AnimatedPadding&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">SizedBox</span><span class="token punctuation">(</span>
            height<span class="token punctuation">:</span> <span class="token number">50</span><span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">Stack</span><span class="token punctuation">(</span>
              children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
                <span class="token function">AnimatedPositioned</span><span class="token punctuation">(</span>
                  duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
                  left<span class="token punctuation">:</span> _left<span class="token punctuation">,</span>
                  child<span class="token punctuation">:</span> <span class="token function">RaisedButton</span><span class="token punctuation">(</span>
                    onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                      <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                        _left <span class="token operator">=</span> <span class="token number">100</span><span class="token punctuation">;</span>
                      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token punctuation">}</span><span class="token punctuation">,</span>
                    child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;AnimatedPositioned&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token punctuation">)</span><span class="token punctuation">,</span>
                <span class="token punctuation">)</span>
              <span class="token punctuation">]</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">Container</span><span class="token punctuation">(</span>
            height<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">,</span>
            color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>grey<span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">AnimatedAlign</span><span class="token punctuation">(</span>
              duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
              alignment<span class="token punctuation">:</span> _align<span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">RaisedButton</span><span class="token punctuation">(</span>
                onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                  <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                    _align <span class="token operator">=</span> Alignment<span class="token punctuation">.</span>center<span class="token punctuation">;</span>
                  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
                child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;AnimatedAlign&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">AnimatedContainer</span><span class="token punctuation">(</span>
            duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
            height<span class="token punctuation">:</span> _height<span class="token punctuation">,</span>
            color<span class="token punctuation">:</span> _color<span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">FlatButton</span><span class="token punctuation">(</span>
              onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                  _height <span class="token operator">=</span> <span class="token number">150</span><span class="token punctuation">;</span>
                  _color <span class="token operator">=</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
                <span class="token string">&quot;AnimatedContainer&quot;</span><span class="token punctuation">,</span>
                style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">AnimatedDefaultTextStyle</span><span class="token punctuation">(</span>
            child<span class="token punctuation">:</span> <span class="token function">GestureDetector</span><span class="token punctuation">(</span>
              child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;hello world&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
              onTap<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                  _style <span class="token operator">=</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>
                    color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">,</span>
                    decorationStyle<span class="token punctuation">:</span> TextDecorationStyle<span class="token punctuation">.</span>solid<span class="token punctuation">,</span>
                    decorationColor<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">,</span>
                  <span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
            style<span class="token punctuation">:</span> _style<span class="token punctuation">,</span>
            duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token function">AnimatedDecoratedBox</span><span class="token punctuation">(</span>
            duration<span class="token punctuation">:</span> duration<span class="token punctuation">,</span>
            decoration<span class="token punctuation">:</span> <span class="token function">BoxDecoration</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> _decorationColor<span class="token punctuation">)</span><span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">FlatButton</span><span class="token punctuation">(</span>
              onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                  _decorationColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>red<span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
              <span class="token punctuation">}</span><span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
                <span class="token string">&quot;AnimatedDecoratedBox&quot;</span><span class="token punctuation">,</span>
                style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">)</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span>
        <span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">return</span> <span class="token function">Padding</span><span class="token punctuation">(</span>
            padding<span class="token punctuation">:</span> EdgeInsets<span class="token punctuation">.</span><span class="token function">symmetric</span><span class="token punctuation">(</span>vertical<span class="token punctuation">:</span> <span class="token number">16</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> e<span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x540E;&#x6548;&#x679C;&#x5982;&#x56FE;9-10&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/9-10.png" alt="&#x56FE;9-10"></p>
<p>&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x70B9;&#x51FB;&#x4E00;&#x4E0B;&#x76F8;&#x5E94;&#x7EC4;&#x4EF6;&#x6765;&#x67E5;&#x770B;&#x4E00;&#x4E0B;&#x5B9E;&#x9645;&#x7684;&#x8FD0;&#x884C;&#x6548;&#x679C;&#x3002;</p>

                                
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